Nature. Research. Results. No matter how far science advances us, we always look to nature to inspire us. Purina ONE formulas combine nature and research for results you can see in your dog. Thanks to a SmartBlend® of high-quality ingredients, including natural prebiotic fibre, Purina ONE Beef & Rice Formula nurtures your dog’s digestive microbiome along with their whole-body health. It’s also made with real beef as the #1 ingredient, and the combination of tasty, crunchy bites and tender, meaty morsels will keep your dog coming back meal after meal.All Purina ONE dry food and wet food options are veterinarian recommended. From a shiny coat and healthy energy to bright eyes and a strong immune system, you could see a difference in your dog in 28 days when you feed Purina ONE.